Matthews is believed to be the only suspect in this investigation, which remains ongoing, state Fire Marshal Butch Browning said. A music genre “black metal” may part of the 21-year-old’s motive, Browning said.

“Again, I will say the threat is now gone,” the official said.

Investigators said evidence suggests a “possible connection” the music genre, which reportedly has a history associated with “church burnings in other parts of the world, which have been documented in movies and books,” the Fire Marshal’s Office said is a statement released today.

“Any questions as to the potential motives of hate are continuing to be vetted by federal authorities,” the agency said.

The collaboration on this case was comprised of the following agencies: the SFM, ATF, FBI and Louisiana State Police. Additionally, assistance was provided by the Louisiana Attorney General’s Office, St. Landry Parish Sheriff’s Office and several other local law enforcement and fire agencies.

“The SFM is also grateful to the Florida Bureau of Fire, Arson and Explosives Investigations for sending a team to participate in the investigation,” the agency said.

Watch the full press conference below:

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